Automatic electric control for elevators



Oct. 28 1924.

1,513,418 P. PETERSON AUTOMATIC ELECTRIC CONTROL FOR ELEVATORS Filed April 16. 1923 5 Sheets-Sheet l P+er Pererson.

14 M FC 7 2 36 R gwuentoz oct. 28, 1924. 1,513,418

' P; l. PETERSON AUTOMATIC ELECTRIC CONTROL FOR ELEVATORS Filed April 16. 1923 5 Sheets-Sheet 2 54/ I FBI 6 Pefer f Pe/emsov.

6H0: new;

Oct. 28, 1924. 1,513,418

P. I. PETERSON AUTOMATIC ELECTRIC CONTROL FOR ELEVATORS Filed April 16'. 1923 5 Shegts-Sheet 5 AUTOMATIC ELECTRIC CONTROL FOR ELEVATORS Filed April 161 1923 5 Sheets-Sheet 5 63 j Q 'F 6 6 a 0TH 2 Pe/er f pefe/"sorf Patented Oct. 28, 1924.

UNITED STATES PETER I. PETERSON, OF WILLMAR, MINNESOTA.

AUTOMATIC ELECTRIC CONTROL FOR ELEVATORS.

Application filed April 16, 1923. Serial No. 632,418.

To all whom it may concern:

Be it known that I, PETER I. PETERSON, a citizen of the United States, residing at Willmar, in the county of Kandiyohi and State of Minnesota, have invented a new and useful Improvement in Automatic Electric Controls for Elevators, of which the following is a specification.

My invention relates to automatic electric elevators and controls therefor which are operated by push buttons, the operation of the elevator being controlled by the passengers and not requiring a special operator.

A feature of the invention is to provide a device by means of which the elevator car, travelling in either the up or down direction, may be stopped by passengers on floors either above or below the elevator car, who wish to travel in the same direction. This increases the efficiency of the elevator.

Another object of the invention is to provide two sets of landing push buttons and to give all push buttons below the elevator car, when the elevator car is travelling in a down direction, preference over all other push buttons.

The invention includes means whereby the push buttons within the elevator car have preference to all push buttons which the elevator car has passed, so that the passengers within the elevator car may reach their destination before the elevator car can be recalled to a floor which it has passed.

A still further object is to provide suitable door switches, gate switches, limit switches and timed switches for controlling the operation of the elevator so that the same is at all times absolutely automatic in operation and. willgive maximum service and efficiency.

In the ordinary electrically controlled ele-- vator of the push button type, the elevator car, upon being dispatched to any particular floor. must complete its. trip to that floor before it can be stopped at any other floor or directed to any other floor. It is true that a assengerin the elevator car can push the stop button and then direct the car to a different floor than was its destination at first, but thisis very seldom done, the stop button being used only in emer 'encies. Therefore, in the common installations of the present time if a person gets into the elevator car at one of the upper floors of the building and dispatches the car to the ground floor, the car can not be halted by people on the intermediate floors, although they also wish to travel to the ground floor. The push buttons at all the floor landings are inoperative as long as the elevator is in operation. This necessitates the cars making a complete trip for each party, thus rendering the system very inefficient at times when there are passengers on several floors who wish to use the elevator at the same time, as, for instance, during the noon hour or similar periods of the day when the majority of the people would wish to travel to the ground floor.

My invention overcomes this disadvantage by providing a system whereby the push buttons on floors between the elevator car and its point of destination remain operative and can take control of the elevator and make the elevator car stop at any of the intermediate floors to take on passengers wishing to travel in the direction in which the car was travelling. Thus the efficiency vator is greatly increased.

In the drawings forming a part of this specification: I

Figure 1 is a wiring diagram showing my invention employed with a system'adapted to perform the functions of my invention in the down direction only.

Figure 2 is a view similar to Figure 1 showing the complete installation of my invention.

Figure 3 is a simplified wiring diagram of the structure shown in Figure 1.

Figure 4 is a simplified wiring diagram of the structure shown in- Figure 2.

Figure 5 is a simplified wiring diagram of a modification.

In Figure 1, I have shown an actual wiring diagram of my invention as installed with alsy'stem which is adapted to take on pasengers who wish to travel in the down.

direction only when the said passengers are located on floors below the elevator car and of the ele-' when the elevator is travelling in the down direction only. In buildings where the traf- .fic is not too great, it is only necessary to shown the invention applied to a building having six stories or floors though it can readily be comprehended that the system may be extended to include buildings of any number of stories, as the occasion may arise.

The car system is operated from any suitable source of electrical supply which is fed to the system by a line indicated at L and L on the extreme right and left hand sides of the diagram. At P P P P P P, I have shown push buttons which are positioned at various landings of the respective floors of the building and which-serve to control and o erate the elevator car, as will presently be escribed. These push buttons are connected in circuits 11, 12, 13, 14, 15

, and 16 which are all connected at one end to a common push button feed circuit 10. In addition to the push buttons P P etc., I provide floor relays FR FR FR FR*, FR FR. These relays correspond to the 'push buttons P P etc., and serve to maintain the circuits made by their respective push buttons and determine the floor at which the elevator car is to stop. These re lays in the drawings have been shown opposite to the push buttons P P etc., although in an actual installation, the same would be located on a suitable panel remotely positioned from the floors to which they relate. The arrangement, however, clearly simplifies the explanation and comprehension of the system and has been so shown for this reason. At each landing, I provide a floor selectors S S ,-S S, S S, which are adapted to be operated by the elevator to make and break contacts when the elevator car arrives at the level of each of the floors to which these floor selectors correspond. These floor selectors may, if desired, be positioned at each of,the floors or they may be remotely positioned and suitable reduction transmission employed and connected therewith WhlCh would cause the same to operate in the same manner, as if they were positioned in the elevator shaft opposite each fioorr Such construction is well known in the art and will not' be explained in detail in this apphcation. These floor selectors serve to stop the eelvator car at the required floor level and also to selectively energize the respectlve push button circuits so that the elevator car may operate in the desired manner.

In" operating the elevator, an electric motor 1s employed which is indicated at M, the

" ,said motor having an armature-A and a field coil FC which in'this instance are connected in shunt across the lines L L This motor may be reversed in the'well known manner .by. reversing the leads to the armature which is;v produced by means of two double pole switches US and DSwhich .serve to cause the elevator to travel in the up and down directions, respectively. Switches US and D3 are connected to two relays UR and DR, which relays become actuated through the relays FR? and FR'-, etc., as the push buttons P and P are manipulated, depending, of course, upon the respective positions of the floor selectors S 5*, etc.

The manner of connecting up the various switches and relays of my invention with the elevator is as follows: The lines 11, 12, 13, 14, 15 and 16 which contain the push buttons P P etc., are ronnected to the movable contacts of the floor selectors S S indicated at SM SM SM SM, and SM and SM. Each of the floor selectors S S etc., are provided with fixed contacts SA SA, SA SA, SA, SA, and SZ, SZ SZ SZ*, SZ SZ, with which the movable contor car is stationary at a landing, the movable contact corresponding to that floor 00- cupies a midway position between the two fixed contacts for said floor, opening both of the circuits passing through these contacts. In Figure 1, the elevator car is shown as stationary at the level of the third floor, all of the movable contacts SM c-tc. above this being in contact with thefixed contacts SA, SA and SA, while the movable contacts below this-floor are in contact with the fixed contacts SZ, and SZ and the movable contact at this floor being in the open position. All of the contacts SA SA etc., are connected to a circuit 54, while all of the contacts SZ, SZ etc., of these selectors are con-- nected to another circuit 55, which two circuits are connected together at 56 to a single conductor 57. The circuit 55 in addition has connected in series in it the coil D of relay DR and the normally closed contact URA of relay UR. Similarly circuit 54 has connected in it the coil URC of relay UR and the normally closed contact DRA of re 7 lay DR. The conductor 57 contains the various elevator car door switches DS D821 limit switches LS d 2 the car gate switch GS and the stop switch SP, all of which are normally closed and is directly connected to the line L at 58.

-When proper contacts are made, .circuits may be completed from line L through contact TRA of relay TRE the push button circuit 10, any of the circuits 11, 12, 13, 14. 1

15 and 16 depending upon which of the push buttons P P etc., are closed, either of the circuits 54 or 55 depending upon the relative position of the arm of the respective floor selector S S S etc., corresponding to the circuit 11,12, 13, etc. which has been closed by means of the particular push button P P P etc., and through conductor 57 the various closed switches LS DS DS etc., to line L.

The motor M is positioned in a circuit 62 which connects at one end with line L and has two branches 63 and 64. The branch 63is directly connected to one of the switch elements DS of switch DS, while the branch 64 is connected with a corresponding switch element US of the other switch US. In a similar manner, a line 65 which is connected to line U is provided with two branches 66 and 67 which connect with the other switch elements US and DS of the up and down switches US and DS respectively. The armature A of motor M is connected by means of two leads 60 and 61, of which lead 60 is formed with branches 68 and 69, of which lead 61 is formed with branches 70 and 71. Branch 68 is connected to switch element US, while the branch 69 is connected to the switch element DS .v In a similar manner. branches 7 0 and 71 are connected to the switch elements DS and US respectively.

V With this arrangement, it can readily be seen that when switch US is closed the current passes through armature A inone direction and when the said switch is open andrent in the field F0 is in the same direction in both instances.

For operating the switches US and DS, I provide relays or coils USC and DSC which are adapted to simultaneously close both the switch elements of each of the switches US and DS respectively. This is diagrammatically indicated in Figure 1 in the drawings. The two coils USC and DSC are connected in two-circuits 80 and 81 which circuits are connected in parallel and are positioned in another circuit 8384 which connects with the lines L and L respectively. The relays UK and DR are provided with normally open contacts URZ, DRZ and DRY respectively. The circuit 80 which contains the up switch coil USC has connected in it the normally open contact URZ, while the circuit 81 which contains the down switch coil DSC has included in it. the normally open contact DRZ of relay DR. With this arrangement, it can readily be seen that when either the up relay UR or the down relay DR is actuated that the respective switches US and DS are respectively closed to cause the motor to revolve in either a right or left handdirection so as to make the elevator our travel in either the up or down direction, as desired. For the sake of illustration, it will be assumed that the relay UR causes the elevator car to travel'in an upward direction and the relay DR causes the elevator car to travel in a downward direction.

For preventing the motor switches US and DS from becoming depressed at the same time and thereby putting the system out of order, I provide a mechanical interlock for the two switches, which is diagrammatically shown in the drawings. This device consists of a lever 500 which is pivoted between the two plungers 501 and 502 of the said switches. Upon the said plungers, are provided two stops 503 and 504 which are adapted to engage the said lever to oscillate the same as the said switches are closed. These stops are sufficiently spaced from lever 500 so that both switches may remain open at one time. When, however, either is closed, lever 500 is oscillated so that the same comes in contact with the stop on the opposite side.

When the device is so set, the closing of one switch causes lever 50-) to be oscillated and the oppositev switch to be opened. It can readily be understood, however, that any form of mechanical interlock may be employed in my invention instead of the form herein shown, which is merely illustrative.

The field FC of motor M is connected in series in a line 86 with a normally open contact FBZ of a relay FB which serves to break the circuit through the said field when the motor is turned off. This line 86 is directly connected across the lines L and L To insure positive building up of the field when the motor is started, a resistance R is placed in a circuit 88. which is shunted across the contact FBZ of relay FB.

In the drawings, I have not shown any rheost-at for starting the motor, though it can readily be comprehended that the same can be inserted in the armature circuit 62-65 in a manner which is well known in the art and need not be described in detail in this application. When certain types of alternating current motors. are used, a rheostart is not required.

As before stated, relays FR FR etc., in conjunction with the floor selectors S S etc, and the push buttons P P etc., serve to operate either the relay UR or the relay DR, which in turn starts motor M, operating the elevator car in either the up or down direction, as desired. The various floor relays FR, FR etc., are each formed with a normally closed contact and a normally open contact indicated at FA F1 1 FA, FA FA, and FZ FZ FZ' FZ, FZ P, FZ respectively. These rela's are further provided with coilsFC F' F0 FC", FC, PC by means of which the said relays may be actuated to open the contacts FA etc, and close the contacts FZ FZ etc., as required. The various coils FC F0 etc.. are connected in the circuits 11, 12, 13, 14, 15, and 16 and are cuit 54 actuated when the push buttons P P etc., ar closed. The normally closed contacts FA FA etc., are arranged in series in a circuit 90 connected at one end to conductor 83, which circuit serves to maintain the said relays actuated after the various push buttons have been momentarily closed, as will presently be described. The various contacts FZ, FZ etc., are connected in a number of leads 91, 92, 93, 94, 95, and 96, which leads connect at one end to the various push button circuits 11, 12, 13, 14, 15 and 16, and at their other ends to the maintaining circuit 90. With this arrangement, it can readily be seen that as soon as the circuit is completed through one of the push button circuits 11, 12, etc., and the corresponding relay actuated, the said relay is maintained in actuation by means of the corresponding contacts FZ, or FZ etc., through the maintaining circuit 90 until the said push button circuit is broken by the particular floor selector corresponding therewith.

The method of controlling the up and down relays UR and DR from the selector circuits 54 and 55 is as follows: The cirfiasses through the coil URC of up relay U through the normally closed contact DRA of relay DR and to its point of connection 56 with the line 57 In a similar manner, line 55 contains the coil DRC of relay DR and also the normally closed contact URA of relay UR. It can readily be seen that when either of the circuits 54 or 55 are energized that the corresponding relays UR or DR are actuated to cause the motor to operate the elevator car in either the up or down direction, as desired. It will further be noted that these two relays,- on account of the contacts URA and DRA. are electrically interlocked so that the elevator car can only travel in one direction atone time, thereby preventing the system from becoming inoperative or failing to properly perform the function for which it is designed. These normally closed contacts, in addition, cut 011' they feed to the other of said selector circuits 54 or 55 when the elevator car is travelling in a particular direction so that the push buttons can not be operated to cause the elevator car to travel in a direction opposite to that in which it is travelling until the said elevator car'come's to rest and both of the contacts DRA and URA become closed.

For giving all of the passengers opportunity to open the elevator gate, in leaving the elevator before the elevator can be started by any of the landing push buttons P P etc., a timed relay TB is employed, which is provided with a normally closed contact TRA, a relay coil TRC and some timing arrangement TRE which, in

this instance, is diagrammatically shown end to line L and which is. connected at its other end to a normally open contact F BY of the field brake -FB. With this arrangement, the circuit through coil TRC is completed when the field brake relay FB is actuated which occurs whenever the motor M is operating, the said circuit being'further completed through the line 86 which is also in connection with the contact FBY of the field brake relay FB by means of a jumper 109 which directly connects contacts FBZ and FBY. It can thus be seen that circuit 10 is normally broken by the relay TR during the operation of the motor M and further remains broken for a short period of time after the motor is stopped which is sufiicient to allow the passengers in the elevator car to open the gate. As soon as they gate of the elevator car is opened, circuit 57 which controls the entire system is broken in a manner to be presently described, which gives the passengers opportunity to leave the elevator. In order to permit the push buttons P P etc., to actuate the system while the car is travelling in the down direction, a

shunt circuit 110 is employed which shunts the contact TRA, said circuit being connected at one end to circuit 10 and at its other end to circuit 83. A normally open contact DRY' on down relay DR is connected in circuit 110 so that the said circuit is closed when the down relay is energized and the elevator car is travelling in the down direction. When this contact is closed the circuit may be traced as follows: The current flows from line L through conductor 83 through circuit 110 which includes the closed contact DRY- and up to circuit 10 shunting the contact TRA of relay TR-E and through circuit 10 through any of the circuits 11, 12, 13, etc., whose push buttons P P P etc., may be closed, which circuits have their selector arms connected with the circuit 55, which is still maintained closed through the contact- URA of relay UR, which not being in operation completes the circuit and from circuit 55 through circuit 57 to the lead L This, therefore, feeds the circuit 10 so that any of the push buttons P P etc., below the elevator car may be operated to control the elevator when travelling in the down direction.

In addition to the landing push buttons P 1?, etc., I provide elevator car push buttons EP E1, E1, EP, EP, EP which push buttons are connected in parallel with the push buttons P P etc. These push buttons have a common lead 107 which is connected to circuit 83 and have individual leads 111, 112, 113, 114, 115 and 116, which connect to the previously mentioned push button circuits, 11, 12, 13, 14, 15 and 16 respectively. lVith this arrangement, it can be seen that the elevator push buttons would operate the system the same as the landing push buttons; excepting that the elevator push buttons have preference over the landing push buttons in being directly connected to line 83 and line L instead of passing through the timed relay TR.

For protecting the system, I have provided a number of normally closed landing door switches, DS DS DS DS, BS and DS positioned in circuit 57 which are connected with .the doors at the various landings and are opened to break circuit 57 when any of the doors at the landings are open. With this arrangement, it can clearly be seen that the elevator can not be started under any circumstances whatsoever, unless the doors of the same are closed. In addition, I provide a normally closed gate switch GS positioned within the elevator car which is adapted to be opened upon opening the gate within the elevator car. I furthermore provide a stop push button SP which is normally closed and which is arranged in conjunction with the elevator push buttons EP and which is used in the case of an emergency to stop the car whatever be the condition of the system. In addition to the landing door switches DS DS etc., I provide two limit switches LS and LS which are arranged to stop the elevator car if for any reason the same should pass beyond the upper or lower floors of the buildings. These switches are also normally closed, the same as door switches DS DS etc.

The operation of my invention can most easily be comprehended frm the simplified wiring diagram shown in Figure 3. For an example, assume that the elevator is stationary at the third floor of the building and has been travelling in a down direction. This would leave all of the selector arms SM, SM and SM above the third floor iii-contact with the selector contacts SA, SA and SA, while the selector that a passenger proceeds into the eleva-' tor, closes the landing door and the elevator car gate. This closes door switch DS and also the gate switch GS, which completes the circuit through circuit 57. It now, the passenger within the elevator pushes the elevator push button EP desiring to travel downwardly to the first floor,

the operation of the system would be as follows: A circuit would then be completed through circuit 83, circuit 111, and circuit 11. The same is further completed through the selector movable contact SM through line 55, through circuit 57 and across to the line L Circuit 11, upon being closed,-energizes coil FC of relay FR which causes the normally open contact FZ to close. All of the contacts FA etc, being normally closed, the circuit is completed through circuit 90 which is connected to the line L. Since the contact FZ is connected by the lead 91 to the circuit 11, it can readily be seen that the current is maintained through the coil FZ, through the circuit 90, thereby maintaining the actuation of said relay. The current now passes through the movable contact SM of floor selector S and through the line 55, through the coil DRC of down relay DR, thereby energizing the same. It willbe noted that circuit also contains the contact URA of relay UR, but this being a normally closed contact, the circuit is still complete. This becomes readily apparent from an inspection of Fig. 1, where the various contacts and coils of the respective relays are shown positioned in proper relation to one another. The current further flows thru the circuit 57 which is connected to the circuit 55 at 56, which circuit contains all of the protective devices, and then to the line L. As soon as the current flows thru the coil DRC, relay DR becomes actuated and switch element DR-A is broken and contact DRY and DRZ are closed. Upon closing contact DRZ, a circuit is completed thru line 83,.contact DRZ, circuit 81, coil DSC, circuit 84, coil FBC, and to the line L This closes the switch elements DS and DS of the down switch DS, which causes the current to flow thru leads 62, 63, switch element DS, leads 69, 60, armature A, leads 61, 70, switch element DS lead 67 and lead 65 to line L thereby energizing the armature and causing the motor to operate. The circuit maybe traced as follows: Upon the operation of relay DR the contact DRZ is closed, whereupon a current flows from the line L through the conductor'83, contact DRZ through the conductor 81, through the coil DSC, through the conductor 84 and to the line L This enerizes relay DS which closes the switches S and DS A current now flows from L through conductor 62, through conductor 63, through DS through conductor 69, conductor 60, through the armature A.

through the conductor 61, through contact DS through conductor 67 and from there on through conductor 65 to L which has the eii'ect of starting the motor to operate the elevator in the down direction. The coil FBC of the field brake relay FB is simultaneously energized since the same is in the circuit 84 which is connected to the two parallel motor switch coil circuits 80 and 4 that the elevator had started in its down-- 81. This has the effect of closin the normally open contacts FBZ and F Y of the field brake relay. Contact FBZ shunts the field resistance R thereby fully energizing the field brake of the armature, while contact FBY connects the timed relay coil in circuit 108 with thecircuit 86 thereby energizing this circuit and atthe same time connects another circuit 712 with the said circuit 86, thereby energizing this circuit. The

circuit 712 is directly connected to a motor brakeMB which permits the motor to rotate. In this manner, it can be seen that, upon the ener izin of the down relay DR, the field coil C 0 motor M and armature A are simultaneously energized and the motor brake released to permitthe motor to propel the elevator car in a downward direction. If the elevator car was arranged to travel without interruption, the same would then travel downwardly until the first floor was reached. As soon as the elevator arrives at the first floor, floor selector S would be operated bringing the movable contact SM into open position thereby breaking the circuit 90-11-5557, deenergizing down relay DR and restoring relay- FR to normal position. Immediately upon de-energizing relay DR, down switch DS would be de-energized and the armature of the motor deprived of current. Upon deenergizing down switch DS, the relay FB would be de-energized and reset to its normal position, which in turn, would open the circuit 108 to the timing relay TR and set the brake MB into operation. MB would quickly stop the elevator at the desired floor and resistance R would again be cut into the field circuit 86. -Due to the timing of relay TR,.circuit 10 would not be instantly closed, thereby iving the passenger in the elevator car suth and thereby render the system inoperable by means of gate switch DS.

slippose now that the elevator push button had been pushed, as before stated, and the circuit '11. maintained through maintaining circuit 90, as before stated, and

ward travel but had not yet reached the second floor. If, in this case, the landing push button P were pushed by a party desiring to travel downwardly to the first floor, the following results would take place:

' Upon the closing of switch P relay F R wouldbe energized through circuit and circuit 57, since the circuit 57 is live during the operation of the elevator. This would cause the relay FR to be actuated, which in turn would close the normally open contact FZ and open the normally closed contact FA'*. The motor M would still con? tinue to operate since the circuit 5557 would be maintained through circuit 12 instead of 11, the same as before. However,

cient time to open the gate.

upon opening normally closed contact FA the circuit-through the normally open con-I tact FZ is broken and the maintainin circuit 90 would no longer feed the circuit 11 and floor relay coil FZ since the push button P is also open. then drop out and relay F B would have the control; The elevator would now travel to the second floor where the elevator would actuate floor selector S to break the circuit 12-55 and stop the elevator, as before specified. As soon as the second passenger enters the elevator car and closes the door and gate, either passenger may again push I This relay would the first floor button in the elevator car and the elevator 'car will descend to the first floor as required.

Still assuming that the elevator is just passing the third fl oor, in a downward direction, as before stated, it will be noted that line 54 which connects all of the floor-selectors above the third floor is broken through the contact DRA of the down relay which is actuated when the elevator is travelling downwardly. This, as isapparent, renders push buttons for all floors above the elevator inoperative when the elevator is travelling in the down direction, until the elevator comes to a standstill at the first floor when the relay DR is duly de-ene-rgized and contact DRA again closed. When, however,

the fact that the contact DRA is openand the circuit 54 broken. If, on the other hand, the elevator is stationary at an intermediate floor and two buttons, one below and one above pushed, the one which comes in first will cause the respective up or down relay to actuate which cuts out the other button. It

is, therefore, practically impossible to oper- 1 ate both the relays DR and UR at the same time, since the actuating circuits for these relays are electrically interlocked. Inladdition,the two switches US and D8 which control. the operation 'of the elevator car are mechanically interlocked which absolutely revents' the actuation of both the switches S and DSsimultaneously. If the elevator is stationary at the third floor and two buttons above the third floor are simultanebroken by the uppermost of the various normally closed contacts FA and FA. This would'be the case whether the buttons are pressed one after the other or at the sametime. In this form of the invention, the picking up of passengers travelling in the same direction can only be performed when the elevator is travelling in the down direction in which the chance would be greatest for passengers wishing to be carried at the same time. .In certain types of building. where the passengers would all leave the building, say at noon or at any other specified time, and would arrive at the building at irregular intervals, this type of elevator would be suitable for the needs.

In Figures 2 and 4, I have shown a type of elevator control in which passengers may be picked up who are situated on floors intermediate of the location of the elevator car and the point of destination thereof, whetherures 2 and 4, it will be notedthat the landing push buttons P P P P and P which were illustrated for controlling the elevator in either direction are now used for controlling the samein the up direction only, while the push button P is omitted. These push buttons are connected in the same manner in the circuits 10, 11, 12, 13,

- 14, and 15. In addition, a number of push buttons PD PD PD PD and PD are provided adjacent the other push buttons for controlling the elevator in the down direction, which push buttons are positioned in a number of leads 360, 361, 362, and 363 connected to the respective lines 12, 13, 14, 15 and16 on one side and to a separate feeding line 210 on the other side. Line 10, is further connected to an additional normally closed contact TRB on timing relay TR by means of which the same is broken, while the operator is opening the gate of the elevator car as previously described. In this form of the invention, the lines 11, 12,13, 14, 15 and 16 are connected tothe'floor relays FR FR etc., and to the selectors S S etc., in the same manner. The floor relays FR FR are however each provided with additional normally closed contacts FB FB F13 FB, F13 and with a number of normally open contacts FY FY FY", FY, FY and FY. In addition an auxiliary maintaining circuit 290 is provided which has connected in series in it all of the normally closed contacts FB FB etc. This gives two maintaining circuits, maintaining circuit 90 being active when the elevator car is travelling in the down direction, and maintaining circuit 290 active when elevator car is travelling in the up direction. The normal] open contacts FY, FY, etc., are connected up in a similar manner to the v which is directly connected to the line L normally open contacts FZ FZ ,'etc., by means of leads, 191, 192, 193, 194, 195, 196, which leads are connected at one end to the lines 11, 12, 13, 14, 15 and 16 respectively and at their other ends to the auxiliary maintaining circuit 290 immediately below the connection of the contacts FB FB etc., in said line respectively.

The motor control of this form of the invention is identical with that previously illustrated, being actuated switches US and DS controlled by the up and down relays UR and DR. The up relay UR has an additional normally closed contact URB and an additional normally open contact URY, while the down relay DR has an additional normally closed contact DRB. The maintaining circuit 290 has connected in it the normallyv closedcontactDRB, while the maintaining circuit 90 has connected in it the normally closed contact URB, both of these circuits terminating at the line 183 n the case of the push button feeding lines 210 and 10, the line 10, in this case, is connected by means of the circuit 110 to the circuit 83, as before. This circuit 110, however, has connected in it the normally open contact URY of the up relay as in the other form. In addition, another circuit 310 is employed, which connects with the push button feeding line 210 in a similar manner and is also connected to the line 83. This circuit has connected in it the normally open contact DRY, which, as before stated, was previously in the circuit 110. l/Vith the exception of these changes, the system shown in Figures 2 and 4 is substantially the same as through the that shown in Figures 1 and 3.

The operation of the second form of my invention is as follows: Assume again that the elevator is stationary at the third floor. A party enters into the elevator and presses the push button E1 desiring to descend to the first floor. The circuit is now completed through lead 83, througl'i I through circuit 111, through circuit 11, through the coil FC of floor relay FR, through the floor selector S through floor selector circuit 55, through coil DRC of down relay DR, through the normally closed contact URA of relay UR, through circuit 57 and from thereon to the line L thereby completing the circuit, as thus described. This causes relay FR to be energized, WlllCl'l causes contacts FZ and FY to be closed. The actuation of relay FR is thereby maintained through the maintaining circuit 90. At the same time, rela DR is actuated which opens contacts D A and DRB and closes contacts DRY and DRZ.- The opening of contact DRA breaks the circuit which might .feed relay UR, thus rendering the same inoperable from accidental closure.

circuit 107,

The opening of contact DRB breaks the circuit 290 so that only the maintaining circuit90 may be utilized, thereby making it possible for floor relays between the position of the elevator and the first floor to get control away from the first floor relay. In addition, the closing of contact DRZ energizes the down switch DS which, in turn, starts the motor M and energizes the field brake relay FBY. This relay, at the same time, actuates the timed relay TR Which breaks the'circuits 210 and 10 from connection with line L ;To permit other passengers wishing to travel in the down direction to stop the elevator car by means of the down push buttonfeeding circuit 210, the break in the same provided with the timed relay TR is shunted by means of the circuit 310 which passes through contact DRY, said contact being closed when relay DR is actuated. It can now be seen that any of the down push buttons may be fed through the line 210, through the said circuit 310. If,

now, any of the down push buttons PD PD, or PD situated above the third floor be closed, no efiect is had upon the system, since all of the floor selector movable contact members SM, SM and SM are in contact with the fixed contacts SA, SA and SA which are connected to line 54. This line, however, is broken by the contact DRA which, being a normally closed contact, is open when the relay DR is actuated. Therefore, the push buttons PD*, PD and PD are rendered inoperable when the. elevator has started to travel downwardly. At the same time, all of the up push buttons P P etc., on account of the circuit 10 being broken through the timed rela TR and through the normally open contact RY of up relay UR, are deprived of feed from the line L Supposing, now, that the elevator has just started but has not reached the second floor. If under these circumstances, the down landing push button PD is pressed, the following results take place: Circuit 210, being fed through contact DRY, is completed through push button PD line 12, coil FC of floor relay FR through floor selector S, the line 55, through normally closed concontact FZ and circuit 90, while circuit 90 tact UR of up relay UR which is actuated through'circuit 57 and to the line L". This immediately actuates relay F R which closes both of the normally open contacts FY and F Z at the same time opening normally closed contacts FA and FB The circuit through FZ is maintained by means of the below the second floor is broken by the contacts FA The opening of this contact immediatel takes the feed from the relay FRF, there y'de-energizing the said relay without tie-energizing the relay DR. The. motor therefore continues to operate, while the only change in the system has been that the ability to stop the elevator-has been transferred from the first floor selector S ing the passengers within the elevator opportunity to open the elevator gate before the push button feed circuits 10 and 210 again become live so that the elevator car control can not be stolen from the passenger until he has had opporutnit to open the said gate and leave the car. The operation of stopping the elevator to takeon passengers when the car is travelling in the up directionis similar to that'just described for .the down direction.

If it should be desired to eliminate the relay TR is omitted and circuits 110 and 310,

together with the. normally open contacts URY and DRY of the up and down relays, are dispensed with. In place of the same, circuits 210 and 10 are directly connected to circuit 83, which circuits have inter ed inthem two normally closed contacts D and DRD which are positioned on the up and down relays UR and DR respectively.

The operation of this form of t e invention is as follows:

Assuming the elevator car stationary at the third floor, asbefore, the passenger within the elevator desiring to go to the first floor pushes push button EP, which energizes relay FR through circuit 11, floor selector S circuit 55,'through the down relay coil DRC, through the normally closed circuit 57 to line L then started by motor M in the same manner as previously described. The energizing of relay DR causes contact DRD on the said contact URA of the up relay UR, through The elevator car is i until the ,elevator car has reached its des- 1 tination and the relay DR has become de-energized and reset and said contact DRD again closed. It can, therefore, be seen that the structure shown in this modification of the invention is adapted to function in a manner similar to that shown in the other 'forms of my" invention with theexception that the timed relay for giving the passenger an opportunity to open the elevator car gate is absent. In the event that the elevator is travelling in the up direction, down relay DR is not energized, whereas the up relay UR is energized. This permits contact D D to remain closed while the normally closed contact URD in line 210 is broken, thereby taking the feed from all of the down push buttonsand permitting only the up push buttons to control the car.

f The advantages of my invention are maniest. eflicient in the transporting of passengers desiring to travel in the same direction. My system can be installed'with existing elevators by merely changing the control to conform with my invention. The system is simple in operating and conforms to all standard methods of installing and control linIg electrical equipment.

, n accordance with the patent statutes, I have described the principles of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire tohave it understood that the construct-ionv shown is only illustrative and that the invention can be carried out. by other means and applied to other usesthan those set forth within the scope of the following claims.

I claim:

1. An elevator control switching means, open circuits for switching means,

comprising motor a plurality of normally controlling said motor switches for momentarily closing said circuits, relays for maintaining d said circuits closed, a maintaining circuit for feeding sald relays, sw1tch1ng means actuated by the movement of the elevator car relative to the landings for controlling the respective up and down movements on said motor switching means, and means for 3 the floor relays.

breaking said'm'aintaining circuit adjacent comprising up and and reverse motor thereby, a palr of circuits 2. .An elevator control down relays, forward switches actuated feedin lectors adapted to be actuated by the move meiit of the elevator car relative to the floor landings for connecting with eitherof said up and down relay circuits, a plurality of normally open circuits connected to said floor selectors, a plurality of floor relays positioned in said normally open circuits, switches in said normally open circuits for momentarily closing the same, a maintaining circuit for said relays and means. for

breaking said maintaining circuit adjacent an actuated floor relay to deprive other floor relays beyond the same from feed.

3. An elevator control comprising forward-and reverse motorswitches, means for actuatingsaid reverse switch means for actuating said forward. switch, circuits .for feeding said actuating means, a plurality of A system is provided which is highly g said up "and down relays, floor se-' normally open circuits, means for selectively connecting said normally open circuits wit either of said actuating means circuits, means for momentarily closing said normally open circuits, means for maintaining said normally open circuits after the same have been momentarily closed and means for depriving all of said maintaining means beyond an actuated one thereof from feed.

4. An elevator control comprising means 7 for operating the elevator in either direction, means for dispatching the elevator to any particular landing, arresting means for. each floor for stopping the elevator at said floors and means for each floor for rendering some of said arresting means inoperative.

' '5. An elevator control comprising means for operating the elevator in either direction, means for dispatching the ,elevator to any particular landing, arresting means for each floor stopping the elevator at said floors, a circuit and switches for each floor connected therein for rendering some of said arresting means inoperative.

6. An elevator control comprising means for operatin the elevator-in either direction, means for dispatching the elevator to any particular landing 'for travel in one direction, means for, dispatching the elevator to any particular landing for travel in the opposite direction, means for stopping the j elevatorat any landing between its position and destination upon rendering one of said ispatching means operable .and means for) rendering the other of said dispatching means inoperable. Q 1

7. An elevator control comprising an up motor switch, adown motor switch, an up relay for actuating said up switch, a down relayfor actuating said down switch, a circuit for feeding said up relay, a circuit for k feeding said down relay, a plurality of normally open circuits for feeding either of said up and down relay circuits, floor selectors for connecting said normally open'circuits with either of said up and down relay feeding circuits, push buttons for momentarily closing saidnormally open' circuits, relays in said normally open circuits, amaintaining circuit for feeding said relays, a plurality of shunt circuits, shunting said push buttons connecting said normally open relays with said maintaining circuits, a plurality of normally open contacts positioned on respective relays, located'in said shunt circuits A and 'a plurality of normally closed contacts positioned on each of said respective relays and located in. said maintaining circuit between the various points of connection of l said shunt circuits .thereto.

of push buttons in said normall open cirdown relay, up and down relay circuits for controlling the same, said up and down relay circuits being adapted to be connected by said floor selector with said normally open circuits, a plurality of floor relays, in said normally open circuits, a maintaining circuit connected with said line and connected in parallel with said feedcircuit, a plurality of shunt circuits connected with said maintaining circuit shunting said push buttons, normally open contacts in, said shunt circuits for breaking the same, said contacts being positioned on said relays and being adapted to be closed upon the actuation of said relays to maintain the actuation thereof upon momentarily closing of said push buttons, and normally closed contacts in said maintaining circuit positioned on said relays adapted to become opened upon actuation of said relays to deprive relays beyond said actuated relay from feed.

9. An elevator control comprising a line, an up push button feed circuit connected to one side of said line, a plurality of normally open circuits connected with said feed circuits, up push buttons positioned in said normally open circuits for momentarily closing the same, a down push button iced circuit connected to said line, a plurality of normally open circuits connected to said down feed circuit and to said first named normally open circuits, down push buttons positioned in said second nornfally open circuits, a plurality of floor selectors connected to said normally open circuits, an up relay and a down relay, an up relay feed circuit and a down relay feed circuit, said two relay feed circuits being adapted to be connected b said normally open circuits and to said oor selectors, motor controlling means operated by 'said up and down relays and connected with the other side of said line, a plurality of floor relays posi-- tioned in said normally open circuits, a pair of maintaimng circuits connected to the first slde of said line vfor said relays,- shunt circuits for shunting said push buttons connected to said normally open circuits and to said maintaining circuits, normally open contacts positioned on said relays and located in each of said shunt circuits and normally closed contacts located in each of said relays and positioned in series in said maintaining circuits between the points of connection of said shunt circuits therewith normally closed contacts located on each oi said up and down relays and juxtapositioned 1n sai malntaining circuits.

10. An elevator. control comprising a line, an up push button feed circuit connected to one side of said line, a plurality of normally open circuits connected with said feed circuits, up push buttons positioned in said normally open circuits for momentarily closing the same, a down'feed circuit, a plurality of normally open circuits connectedto said down feed circuit and to said first named normally open circuits, down push buttons positioned in said second normally open circuits, a plurality of floor selectors connected to said normally open circuits, an up relay and a down relay, an up relay feed circuit and a down relay feed circuit, said two relay feed circuits being adapted to be connected by said normally open circuits and to said floor selectors, motor controlling means operated by said up and down relays and connected with-the other side of said line, a plurality of floor relays positioned in said normally open circuits, a pair of maintaining circuits for said relays, shunt circuitsfor shunting said push buttons connected to said normally open circuits and to said maintaining circuits, normally open contacts vpositioned on said relays and lo-' cated in said shunt circuits and normally closed contacts located on each of said relays and positioned in series in said maintaining circuits between the points of connection of said shunt circuits therewith, normally closed contacts located on each of said up and down relays and juxtapositioned in said maintaining circuits, a timed relay connected with said motor operating means and adapted to become energized upon the starting of said motor, normally closed contacts a formed on said timed relay circuits connecting said push button feed circuits with said normaliy closed contacts and with one side of said line and normally open contacts located on said up and down relays and positioned in their respective push button feed circuits between the said timed relay contact circuits and the line.

11. An elevator control comprising means for operating the elevator in either direction, means for dispatching'the elevator to any particular landing for travel in one direction, means for dispatching the elevator to any particular landing for travel in the opposite direction, a circuit and a plurality of switches therein for stopping the elevator at any landing between its position and destination upon rendering one of said dispatching) means operable and means for rendering the other of said dispatching moans inoperable.

12. Anlelevator control comprising motor switching means, a plurality of normally open circuits for controlling said motor switching means, switches for momentarily,

closing said circuits, means for maintaining said circuits closed, a maintaining circuit for feeding said means, switching means actuated by the movement of the elevator car relative to the landings for. controlling the'respective up and down movements of said motor switching means, and means for breaking said maintaining circuit adjacent said means.

13. An elevator control comprising means for operating the elevator in either direction, a circnit having switches therein for controlling said operating means, means for each floor for maintaining said circuits closed, a feeding circuit for said maintaining means and means for breaking said feeding circuit adjacent said maintaining means.

PETER I. PETERSON. 

